03-04-2005
Script scheduling problem using "at" command
Hello!
I'm writing a shell script that will monitor if a server is up or down.
I would like to use the command "at" inside of my script to reschedule the script to run in 2 minutes but I can't pass parameters to my script and this is my problem...
This is the idea behind the script:
1. The script run in "normal mode" and check if the server is up. If the server is not responding, the script go to step 2.
2. Schedule itself to run in two minutes in "prealert mode"
3. When running in "prealert mode", the script check if the server is still not responding and if not, send a alert to the network administrator.
Does anybody know how to pass parameters to a commmand or script while using the "at" command. I know I can put everything in a file and make at use that file but I would prefer not to... Any suggestion?
Syntax example to execute the script:
./test_ping prealert server1.test.com
Here is a sample of my script:
#!/bin/bash
#Script to test network connectivity
#By Benoit Charbonneau
#March 4th 2005
#Parameters ex.: test_ping mode(normal|prealert) server
log="../monitoring.log"
date=$(date)
path=$(pwd)
script=$path/test_ping
ping -c1 -w2 $2 > /dev/null
error=$?
if [ $1 = "normal" ]; then
if [ $erreur != 0 ] ; then
at -f "$script prealert $2" now + 2 minute
# My problem is here
echo $date $2 ping error - A prealert has been open >> $log
else
echo $date $2 ping ok >> $log
fi
fi
if [ $1 = "prealert" ]; then
...
Sorry if i'm not clear enought. English is not my first language...
Thank you for your help!
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LEARN ABOUT MOJAVE
jrunscript
jrunscript(1) General Commands Manual jrunscript(1)
NAME
jrunscript - command line script shell
SYNOPSIS
jrunscript [ options ] [ arguments... ]
PARAMETERS
options
Options, if used, should follow immediately after the command name.
arguments
Arguments, if used, should follow immediately after options or command name.
DESCRIPTION
jrunscript is a command line script shell. jrunscript supports both an interactive (read-eval-print) mode and a batch (-f option) mode of
script execution. This is a scripting language independent shell. By default, JavaScript is the language used, but the -l option can be
used to specify a different language. Through Java to scripting language communication, jrunscript supports "exploratory programming"
style.
NOTE: This tool is experimental and may not be available in future versions of the JDK.
OPTIONS
-classpath path
Specify where to find the user's .class files that are accessed by the script.
-cp path
This is a synonym for -classpath path
-Dname=value
Set a Java system property.
-Jflag
Pass flag directly to the Java virtual machine on which jrunscript is run.
-l language
Use the specified scripting language. By default, JavaScript is used. Note that to use other scripting languages, you also need to spec-
ify the corresponding script engine's jar file using -cp or -classpath option.
-e script
Evaluate the given script. This option can be used to run "one liner" scripts specified completely on the command line.
-encoding encoding
Specify the character encoding used while reading script files.
-f script-file
Evaluate the given script file (batch mode).
-f -
Read and evaluate a script from standard input (interactive mode).
-help
Output help message and exit.
-?
Output help message and exit.
-q
List all script engines available and exit.
ARGUMENTS
If [arguments...] are present and if no -e or -f option is used, then the first argument is the script file and the rest of the arguments,
if any, are passed as script arguments. If [arguments..] and -e or -f option are used, then all [arguments..] are passed as script argu-
ments. If [arguments..], -e and -f are missing, interactive mode is used. Script arguments are available to a script in an engine variable
named "arguments" of type String array.
EXAMPLES
Executing inline scripts
jrunscript -e "print('hello world')"
jrunscript -e "cat('http://java.sun.com')"
Use specified language and evaluate given script file
jrunscript -l js -f test.js
Interactive mode
jrunscript
js>print('hello world');
hello world
js>34 + 55
89
js> thread(function() { print('hello world'); }
hello world
js>
Run script file with script arguments
jrunscript test.js arg1 arg2 arg3
test.js is script file to execute and arg1, arg2 and arg3 are passed to script as script arguments. Script can access these using "argu-
ments" array.
SEE ALSO
If JavaScript is used, then before evaluating any user defined script, jrunscript initializes certain built-in functions and objects. These
JavaScript built-ins are documented in jsdocs.
06 Aug 2006 jrunscript(1)